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"I see in slow motion replays, is most pros drop their elbows simultaneously or right before they contact the cueball, and when they are at the end of their follow thru, their cues are almost perfectly level. I am not so sure that the purpose of doing this is to keep the cue level, since if it is level at the point of contact of the CB and cuetip, keeping it level afterwards serves no purpose."
The purpose of level cue follow through, is to flatten the ball path lines. I believe the player to be transferring mental energy into the follow through. This completes the visual/kinetic path of the balls. To me follow through force creates position via the transfer of energy from the follow. When a player holds at the end of the cue I feel It is more possible to have a level cue at the end of the swing by dropping the elbow, and manipulating the wrist to create level stroke at the butt end of the cue during the apex. I notice the more I drop elbow, the more cue hangs out the end of the bridge for follow through. There is something to it. Look at all sports follow through is critical to any player baseball swing, golf swing,football QB, everything is similar, a system.
I believe draw is not quite as level a follow through, it is level enough at the apex. Droping the elbow some will create long draw capabilities to your arsenal hit speed comes into play too. I believe to hit at basicaly above felt level for draw I do have to jump up sometimes so as not to interfere with the draw path of cueball on short draw. I create forced side draw, 5oclock, and 7oclock cueball english by
elbow drop sometimes. I keep in mind each shot has a completely different stance, hit, followthrough, and speed. It requires a fresh aproach to each shot. I also try to get alot of oxygen to my brain while I am shooting for obvious reasons.
As far as these BBS systems, It all is a matter of opinion for us, so if your opinion is saying, I know everything, and no one here has anything to teach but me, so be it. That style of thinking is outdated. I believe we are all students all the time. I respect everyones opinions. History shows the new school of thinking will always replace the old. We as a society should always respect historical figures, and thought systems, I just keep a open mind.